I have made very little progress on the model, but I found some very helpful information in both C.L. Zinn's "AMX Photo Archive" book and this unknown magazine(?) blurb, found on an AMC forum:

I though the windshield appeared to be "leaned back" from stock, and this article seems to confirm that. Ditto for the roof cutouts which I could just make out in other pics, but wasn't quite sure why they were present. I need to find this August '68 issue!